content: /**
   * Copyright (c) 2012-2017, Andy Janata
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without modification, are permitted
   * provided that the following conditions are met:
   *
   * * Redistributions of source code must retain the above copyright notice, this list of conditions
   *   and the following disclaimer.
   * * Redistributions in binary form must reproduce the above copyright notice, this list of
   *   conditions and the following disclaimer in the documentation and/or other materials provided
   *   with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
   * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
   * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
   * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  package net.socialgamer.cah;
  
  import javax.servlet.http.HttpServletRequest;
  
  import net.socialgamer.cah.Constants.AjaxRequest;
  
  
  /**
   * Wrap around an {@code HttpServletRequest}, to allow parameters to be retrieved by enum value.
   *
   * @author Andy Janata (ajanata@socialgamer.net)
   */
  public class RequestWrapper {
    private final HttpServletRequest request;
  
    /**
     * Create a new RequestWrapper.
     *
     * @param request
     *          An {@code HttpServletRequest} to wrap around.
     */
    public RequestWrapper(final HttpServletRequest request) {
      this.request = request;
    }
  
    /**
     * Returns the value of a request parameter as a String, or null if the parameter does not exist.
     *
     * @param parameter
     *          Parameter to get.
     * @return Value of parameter, or null if parameter does not exist.
     */
    public String getParameter(final AjaxRequest parameter) {
      return request.getParameter(parameter.toString());
    }
  
    /**
     * Returns the value of a request header as a String, or {@code null} if the header does not
     * exist.
     *
     * @param header
     *          Header to get.
     * @return Value of header, or {@code null} if header does not exist.
     */
    public String getHeader(final String header) {
      return request.getHeader(header);
    }
  
    /**
     * If there is an {@code X-Forwarded-For} header, the <strong>first</strong> entry in that list
     * is returned instead.
     * @see HttpServletRequest#getRemoteAddr()
     */
    public String getRemoteAddr() {
      String addr = request.getHeader("X-Forwarded-For");
      if (null != addr) {
        addr = addr.split(",")[0].trim();
      } else {
        addr = request.getRemoteAddr();
      }
      return addr;
    }
  }
  